Fluid pressure control mechanism



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FLUID PRESSURE CONTROL MECHANISM' Filed June 7, 1941 2 sheets-sheetz Tidg, 2. I mi INVENTOR BURTON E AIKMAN a v nauwe/LAND HANDLE OF'F' ATTORNEY Patented Aug. 17, 1943 FLUID PRESSURE coNjrRoL MECHANIsM Burton S. Aikman, Wilkinsburg', Pa., assignor to The Westinghouse Air Brake Company, Wilmerding, Pa., a corporation of Pennsylvania Application June 7, 1941, Serial' No. 397,018 45 claims. (o1. 19a-.01)

This invention relates to iiuid pressure control mechanism and more particularly to a mechanism for selectively controlling the operation of a plurality of devices. l

Certain railway vehicles propelledby internal combustion engines, particularly of the Diesel type, are provided with a power transmission system connecting the engine'to the drive wheels which includes, in addition to a Suitable disconnecting clutch such as the fluid type, a selective,

directional forward and reverse control'and a selective high and low -gear transmission to provide different speed'ratios between the engine and drive wheels. 4'Ihe selection of these different drive arrangements is obtained by the en- 15 gagement and disengagement of suitable clutches, that isY a clutch is engaged to provide for forward movement of the vehicle and a different clutch is engaged to provide for reverse movementfwhile with either of these clutches engaged another clutch is adapted to be engaged to provide a low gear drive for starting the vehicle while still a fourth clutch is adapted to be engaged to provide a high gear drive. All of these clutches are controlled hydraulically, be 25 ing engaged when subject to hydraulic pressure and disengaged when the hydraulic pressure is relieved. It Will be apparent then that when the forward clutch or low gear clutch is engaged,

the reverse clutch and high gear clutch must be .'disengaged, and vice versa.

One object ofthe invention is the provision of an improved control system for selectively controlling the operation of a plurality of devices such as the forward and reverse and high and low gear clutches just described.

Another object of the invention is the provision of a pneumatic system particularly adapted to provide for remote, selective control of a plurality of devices such as the clutches just described.

Another'object of the invention is the provispeed; and still another object o f the invention is therefore the provision of means adapted to operate automatically to cause the speed of the engine to reduce to idling at the time of changing any one of the speed change gear clutches or of the forward and reverse clutches and after such change has been eected to automatically increase the speed of the engine to that existing `before initiating such change.

Other object-s and advantages will be `apparent from the following more detailed description of the invention.

In the accompanying drawings; Fig. 1 is a diagrammatic view, partly in section and partly in outline, of the improved clutch and throttler control system, shown applied to two coupled power vehicles or locomotives |and arranged to be controlled -by vthe operator on the leading locomotive, which it will be assumed is at the lett-'hand A side of the drawing; Fig. 2 is a vertical sectional 4View of a selector 'valve device shown in elevation in Fig. '1; Figs. 3 and 4 are sectional views'taken on the lines 3-3 and 4 4, respectively, in Fig. 2; Fig. 5 is a view taken in the direction of the arrow 5 in Fig. 3; Fig. '6 is a plan View of an adjusting key; Fig. -7 is an enlarged side view of the top portion of a manually operative control device shown in Fig. 1; and Fig. 8 is a plan view of said manually operative control device-with certain parts broken away to show detailed structure.

Description Referring iirst to Fig. 1, the reference numeral I indicates a propulsion engine for a vehicle which is adapted to apply power to a driving axle 2 extending transversely of the vehicle and connected at opposite ends to drive wheels (not shown). For transmitting power :from the engine I to 4axle 2, said engine is adapted to be connected through a suitable clutch (not shown) to a primary drive shaft 3', which extends into a speed change transmission device 4. A secondary drive shaft 5 is mounted in this device at one side of shaft 3 and extends parallel thereto. The shaft 3 is provided with a relatively small gear 6 and a relatively large gear 1 which are in constant mesh with gears 8 'and 9 'respectively mounted on the secondary drive shaft 5, the

meshing gears 6 and B providing for speed reduction and thus constituting a low gear drive be- 5 tween the two shafts while themeshing gears 1 land. 9 provide for speed increasingand thus constitute a high gear drive between said shafts.

Both of the smaller gears B and 9 are keyed to their respective` shafts for rotation therewith, while the larger gears 'l and 8 are journaled on their shafts between two spaced collars I0 which are adapted to hold the gears against longitudinal movement.

At one side of gear 8 is a low gear clutch Il comprising a movable clutch element l2 slidably mounted on the shaft and a xed clutch element I3 which is associated with the gear 3. A key I4 secures the clutch element I2 to the shaft 5 for rotation therewith and provides for movement of said element relative to said shaft into and out of driving contact with the xed element I3 on gear 8. When these parts are disengaged as shown in the drawing the gear 8 is adapted to idle on the secondary drive shaft 5, but when engaged, power applied to said gear from the smaller gear 6 on the primary shaft 3 is adapted to effect rotation of the secondary shaft 5 through the clutch I I.

For controlling the low gear clutch II there is provided a conventional shifting lever I5 connected at one end to the movable clutch element I2 and at the opposite end to one end of a rod IB projecting from a hydraulically controlled low gear cylinder I1. 'This cylinder comprises a casing containing a piston I8 having at one side a pressure chamber I9 connected to a low gear control pipe 2l) through which liquid under pressure is adapted to be supplied to said chamber and released therefrom by mea-ns to be hereinafter described. The piston I8 has at the opposite side a non-pressure chamber 2| and the rod I6 extends through this chamber and is connected to the piston I8. A clutch disengaging spring 22 is provided in chamber 2l for acting on piston I8 to move same to the position-shown upon the release of hydraulic pressure in chamber I8 for releasing the low gear clutch Il.

A high gear clutch 23 is provided for connecting and disconnecting shaft 3 to and from gear 1. This clutch may be identical to clutch -II and be controlled through the medium of a shifting lever I5 and rod I6 from a high speed hydraulic control cylinder 24 like the cylinder I1 but adapted to be controlled through the medium of a high gearcontrol 25.

It will be noted thatl when the low speed hydraulic cylinder I1 is subjected to hydraulic pressure and the high speed cylinder 23 is relieved of hydraulic pressure, power will be transmitted from the primarydrive shaft 3 to the secondary drive shaft 5 through the gears 6 and 8 which constitute a low gear or high torque drive connection between the engine and drive axle 2 intended for use in starting the vehicle. When the cylinder I1 is relieved of hydraulic pressure and the cylinder 23 is subject to hydraulic pressure, power will be transmitted from the primary drive shaft 3 to the secondary drive shaft 5 through gears 1 and 9, which constitute a relatively low torque and high gear connection adapted to be 'used for driving the vehicle after its speed has been increased to above a certain degree by use of the low gear drive just described.

I'he secondary drive shaft 5 extends into a selective forward and reverse directional control device 21 and therein is provided with a bevel gear 28 which is in constant mesh with two oppositely disposed'bevel gears 29 and 30 which are journaied on the drive axle 2 and which are held in mesh with gear 2-8 and against with the gear 30 for the same purpose. Each of the clutches 32 and 33 comprises a movable clutch element 35 like the element II and slidably mounted on axle 2 and which is adapted to cooperate with a projecting clutch portion 36 of the adjacent gear to provide a drive connection therebetween and said axle. The forward clutch 32 for the gear 29 is adapted to be engaged by hydraulic pressure applied to a forward control cylinder 31 and transmitted therefrom through shifting lever I 5, while said clutch is adapted to be-released upon the releaseof hydraulic pressure in said cylinder, the pressure in said cylinder being controlled through the medium of a forward control pipe 38. The reverse clutch 33 for -gear 3|) is adapted to be controlled in a similar manner by a reverse control cylinder 48 connected to a reverse control From the above description it will now be noted that when hydraulic pressure is applied to the forward control cylinder 31, movement of the vehicle in a forward direction will be provided lfor, while when hydraulic pressure is applied to the reverse cylinder movement of the vehicle in reverse will b provided for and it will.

also be noted that when one of these cylinders is under pressure the other must be relieved of pressure. It will be further noted that for both directions of vehicle movement the operation of the low and high speed gear cylinders I1 and l 24 in the speed change transmission device 4 longitudinal movement on said drive shaft by Y will provide both a low gear and high gear drive connection betweenthe engine I and axle 2.

It is desired to point out that the gear and clutch control arrangement shown in the transmission device 4 and the structure of the forward a-nd reverse directional control device 21 are merely diagrammatic in form and are employed for illustrative purposes only.

According to the invention a selector valve 45 is provided for selectively controlling through the medium of pipes 20, 25, 38 and 4I the operation of the several clutch control cylinders I1, 24, 31 and 40, respectively, to select the drive ratio between the engine I and vehicle axle 2 and also the direction of vehicle movement. The selector valve 45 in turn is adapted to be controlled by Variations in fluid pressure in a control pipe 46 extending from one end of the vehicle to the opposite end. Both ends of pipe 46 are provided with suitable connectors 44 for connection with a like pipe on a coupled vehicle so that the selector devices 45 on two coupled vehicles may operate in unison to provide the same directional control an'd speed drive connection between the engines and axles of the two vehicles. For in turn controlling the pressure variations in the control pipe 46, each vehicle is provided with a manually operative controller 41 which is connected to the control pipe 46 through a branch pipe 48. A cut-outI cock 49 is provided in pipe 48 for disconnecting, the control pipe 46 from the controller41 which is not being used, that is, the controller on the second vehicle for instance when two vehicles are coupled together and adapted to be controlled from the leading vehicle.

The selector valve 45 comprises a casing section 50 to which all of the pipes 20, 25, 38 and 4I above mentioned are connected. To the casing section 50 is also connected a pipe 5I leading from a hydraulic supply reservoir 52 which is with a liquid, such as oil, under pressure.

The hydraulic supply' pipe 5| is connected to a passage 53 in the casing section 50 which leads to two valve chambers 54 and 55. The pipe 20 is open to a passage 56 and in chamber 54 is a valve 51 having a fluted stem 58 extending' y through passage 56 and past a valve seat 59 into a chamber 60 which is open through a release outlet 6| to an oil sump (not shown).

The chamber 60 is separated from a chamber 62 by a partition wall 63 through which there is provided a bore in coaxial relation with the valve stem 58 and connecting said chambers.

A piston stem 64 has a neat sliding t in this bore and projecting from the end of this stem into chamber 60 is a portion 65 of reduced diameter having on its end' a taperedvalve 66 for engaging the valve seat 59. Above the valve 66 the stern 64 is provided with a valve 42 adapted to engage a seat 43. v

' When the piston stem 64 occupies the position shown, the valve 42 is adapted to be seated, and the valve 66 unseated under which cc-ndition the valve 51 is adapted to be seated by the pressure of a spring 61. When the valve 66 is moved into engagement with the seat 59,- such movement is adapted to act through the uted stem 58 to unseat the valve` 51.

The chamber 62 is open at'lits upper end to an enlarged bore containing va piston 69 which is connected to the stem 64. At the upper face of piston 69 is a chamber 10 which is open through a port '1| to a control passage' 12. A-

coil spring 13 encircling rod 64 in chamber 62 is supported at one end on partition wall 63 and bears at the opposite end on piston 69 for urging said vpiston upwardly to the position shown. The `pressure of spring 13 on piston 64 is such as to require an increase in fluid pressure to a chosen degree in chamber 10, such for instance as thirty-five pounds, for lmoving the piston downwardly to seat valve 66 Iand unseat valve 51. A

In the upper position of piston 69 a port 15 is open to` chamber 62 below the piston, this port being constantly in communication with a timing reservoir 16 which may be open to the control passage 12 by way of a, check valve 11. This check valve is arranged to permit ilow of uid in the direction from the timing reservoir to passage 12 but to prevent flow in the opposite direction. The port is arranged so-that movement of piston 69 in a downwardly direction will lap same.

Disposed at one side of the piston 69 is a similar piston 80 having at its upper face a chamber 8| which is open to the control passage 12 through a choke 82. At the lower face of piston 80 is a chamber 83 which is open to the atmosphere through a breather port 84, and projecting from the piston through this chamber and a partition wall 85 into a chamber 86 is a. piston stem 81. A valve 18 is provided on stem 81' to engage a seat 19 when the parts are in the vposition shown.

A valve 90 is providedon the end of piston stem 81 in chamber 86 and is adapted to cooperate with a valve seat 9| upon downward movement of piston 80 for closing vcommunication between a passage 92 open to pipe 25 and chamber 86. Projecting through passage 92 and valve seat 9| is the luted stem 93 ,of a poppet valve 94 contained in chamber 55. The valve 90 upon movement into engagement with seat 9| is adapted to act through the valve stem 93 to unseat the valve 94 to thereby establish communication between the oil supply passage 53 and passage 92. Upon unseating of valve 90 a spring 95 is adapted to seat the valve 94.

Encircling the piston stem 81 in chamber 83 is a coil spring 96 supported at one end on the partition 85 and bearing against said piston. This spring is of such value as to require an increase in fluid pressure in chamber 8| on the piston 80 to a degree such as sixty-rive pounds for effecting movement of the piston to its lower position.

The two passages 56 and 92 lead to the opposite ends of a chamber 91 containing a double check valve 98 which is operative to control com'- munication between these passages and an outlet passage 99 which opens to said chamber intermediate the ends thereof. When liquid under pressure is supplied past the -valve 51 to passage 56 a portion of the liquid is adapted to flow to chamber 91 and move the double check valve 98 to the position shown for thereby closing communication between the passage 99 and the passage 92 and for opening passage 99to passage 56.. When liquid under pressure is supplied to passage 92 upon'unseating of valve 94th@ double check valve 98 is adapted to be moved thereby to an 'opposite position for closing communication between passages 99 and 56 and for connecting the passage 99 to passage 92.

A tapered plug valve |05 isy mounted to turn in a suitable tapered bore provided in the casing section 50 beyond the connection-with pipe '25.'

This valve isprovided around its periphery adjacent its smaller end with an annular groove |06 in permanent communication with one end of passage 99y leading to the double check valve chamber 91. The groove |06 is connected by a radial passage |01, shown in Fig. 3,' to an axial passage |08 leading to four radial bores |09 which are equally spaced apart and open at the peripheral surface of the valve.

The reverse control pipe 4| is open through a passage ||0 tothe seating face'of the plug valve in such a location that one or another of the radial bores |09 will register therewith upon rotation of the valve in its bore. The forward control pipe 38 is also open through a passage I to the seating face of the plug valve in the same radial plane as the passage ||0 but spaced forty five degrees therefrom. Between each two radial bores |09 the plug valve has another radial bore lI |2 so located as to register with either passage I0 or passage upon turning of the' plug valve in its seat. Each bore ||2 is open to a port 3 extending longitudinally of the valve and through the larger end thereof to atmosphere. It will be noted that the foul? radial passage |09 are spaced ninety degrees from each other and the Vfour intermediate radial passages H2 are also spaced'nin'ety degrees .trom ot and forty ve degrees from the por-,ts when one of either set of pass 38 one of the other set of pa s, to the pipe 4| and it will be -f-u l the connections betweenthese p' sa-ges a will be reversed upon each fortyy 've degjr, rotation of the plug valve in its seat. Fer turning the plug valve in tsvseat a oneway acting clutch isprovided which comprisesa |20 is provided in a casing section |2| a portion of which constitutes a cover for chambers and 8| above the pistons 69 and 80, respectively, The piston has a stem |22 depending therefrom along one side of and at right angles to the axis of the plug valve |05. This stem is provided with a longitudinally extending slot |23 and is so arranged that the ratchet teeth I |8 on the wheel |l1 areadapted to turn through said slot. A pawl |24 is rockably mounted on a, pin |25 which is carried in a bracket |26 secured against the upper closed end of the slot |23 by a screw |21. The lower hook shaped end of the pawl |24 is aligned to move over the periphery of the ratchet wheel. A leaf spring |28 associated with the bracket |26 acts on pawl |24 for urging same into engagement with the ratchet wheel ||1. It will be noted that the ratchet wheel ||1 extending into the slot |23 cooperates vin'th the stem |22 to secure said stem against turning so as to thereby maintainv the pawl |24 in operating alignment with the teeth ||8 on the ratchet wheel ||1.

.The piston |20 has at its upper face a pressure chamber |30 which is open to the fluid pressure control passage 12. At the lower side of piston 20 is a chamber |3| which is in constant communication with the atmosphere through the slot |23 in the stem |22 and which containsa coil spring |32 acting on the piston urging it in an upwardly direction. The pressure of this spring on the piston is such that an increase in fluid pressure in chamber |30 to a certain degree such as ten pounds is required to urge the piston to its lower position shown. When the pressure in chamber 30 is of a lower degree, the spring |32 is adapted to urge the piston |20 to an upper p0- -sition dened by contact between an extension |33 of the piston and a cover |34 which is secured to the casing section |2| for closing the upper open end of said chamber.

The degree of movement of .piston |20 from the position shown to its upper position just mentioned is adapted through the operation of pawl |24 to eiect rotation of the plug valve |05 through an angleof forty five degrees to thereby reverse the connection of pipes 38 and 4| with the radial bores |08 and ||2 in said valve.

A disk |40 is secured to the larger end of the plug valve |05 in any suitable manner as by rivets |4|. This disk is adapted to turn with the plug valve in a pocket |42 provided in an extension ofthe casing section50. Between the outer end wall of this pocket and the plugr valve is inter` posed a spring |43 acting on said valve for maintaining it against its seat.

The upper end of qthe pocket |42 is'provided with an opening |44 of a slightly greater circumferential length than forty five degrees and at either end of said opening is a shoulder |45. In the outer end wall of pocket |42 a window |46 is provided substantially mid-way between the shoulders |45 and the disk |40 on its outer face eight equally spaced legends Rand F which stand respectively for forward and reverse direction of movement of the vehicle and which are arranged alternately and adapted to pass behind this window as the plug valve is turned.

One of these legends is adapted to coincide with window |46 in each of the eight different operating positions of the plug valve and the legend which is visible is intended to indicate the direction of vehicle movement as determined by the position of the plug valve |05 and which of the control cylinders 31 and 40 in the forward and of said opening for turning the plug valve t0 a l desired position for reversing the connections through the plug valve to the clutch control cylinders 31 and 4 0 in the forward and reverse directional control device 30, under a condition which will be later described.

The control passage 12 is connected to pipe 46 which extends from one end to the other of the vehicle and which is connected by the branch pipe 48 to the manually operative controller 41 whereby through the medium of said controller the selective operation of the pistons |20, and 69 in the selector deviceI 45 and thereby the selective operation of the several control cylinders and clutches i n the speed change transmission device 4 and forward and reverse directional control device 21 may be effected.

The control of these several devices is dependent upon the establishment of different degrees of uid pressure in the control pipe 46 and the controller 41 may therefore be of any desired type which will provide and maintain such pressures in said pipe. Preferably however, the controller 41 is of the type which will vary the pressure in pipe 46 in accordance with the angular position of a manually operative control handle |50 from a normal or neutral position.A A device of this type is fully disclosed in Patent'1,939,907 issued to E. K. Lynn on December 19, 1933 and since reference may be had to this patent a further description of the iiuid pressure control portion of this device is not deemed essential.

As shown in Figs. 7 and 8 the handle |50 is adapted to be turned over a quadrant I5| from a position in engagement with a shoulder |52 at one end of the quadrant to a position in -engagement with a shoulder |53 at the opposite end of the quadrant. In the peripheral face of the quadrant there are provided three notches |54,

|55 and |56 and in the handle there is a spring may therefore be called reverse position. When the handle is in the position shown in Fig. 8, defined bydetent |51 entering notch |54 the controller 41 is adapted to establish and maintain a desired pressure, such as iifteen pounds, in the control pipe 46. This position may be called neutral and handle-off position and is adapted to be used for causing disengagement of both of the clutches and 23 in the speed change transmission device 4. When the handle |50 is in the position deiined by the detent |51 entering notch |55 the controller 41 is adapted to establish and maintain a chosen pressure such as thirty live pounds in the control pipe 46 for rendering the low gear clutchv eiective. This position may therefore be called the low gear position. When in the pos-ition defined by the detent entering notch |56 and in which the handle also engages shoulder |53 the controller is adapted to establish and maintainl a higher chosen pressure such as sixty five pounds in the control pipe 46 forrendering the high gear clutch 23 effective and this position may therefore be .called the high gear position.

The reference numeral |60 indicates a throttle control cylinder for the engine 'lhis cylinder comprises a casing containing a piston |6| and a rod |62projecting from the piston and operatively connected by any suitable means (not shown) to the throttle of the engine The pis- -ton |6| has at one side a pressure chamber |63 to termined by the pressure of spring |64 in ac-v cordance with the pressure of iluid supplied to chamber |63. The pistonv may thereforehave an idling position as indicated and be movable to any selected position between the idling and maximum speed position, also indicated on the drawing, for providing any desiredv degree of speed or power of engine l For remotely controlling the position of the throttle piston|6| a manuallyoperative throttle control valve device |65 is provided. This device may be generally similar to the manually operative controller 41 in that it comprises valve means (not shown) conditionable by a handle 66 for' supplying fluid to a control pipe |61 at a pressure which varies in accordance with the degree of 4 angular movement of the handle from a normal position;

The pipe' 61 is 'in constant communication with valve chamber |68 of 'an interlock valve device |69. This device comprises a slide valve |10 disposed in the chamber |68 and having a normal position shown for connecting said chamber to avpipe |1| leading to a throttle control pipe |12 which extends from end to end of the vehicle for connection with a similar control pipe of a cony ynected vehicle, -in case of double heading, by

means of suitable connectors |13. The pipe |12 is connected by a branch pipe |14 to a relay valve devicev |15 and this device isadapted to respond to pressure variations in the pipe |12, as effected by operation of the manually operative throttle control valve device |65, to provide corresponding variations in pressure in chamber |63 of the -throttle control device |60 to thereby adjust the throttle and speed or power of engine in aci cordance with the position of the handle |66.

Relay valve devices-arealso well known and since referencemay be had to Patent 2,096,491

issued to Ellis E. Hewitt on October 19, 1937, which'discloses in detail the relay valve device |15, a further description and showingthereof are not deemed essential in the present application. f

The interlock valve device |69 further comprises a ilexible diaphragm |80 which is clamped around its periphery and operatively connected at'its center to a stem |8| disposed in the valve chamber |68. The'slide valve |10 is mounted between spaced shoulders |82 on the stem |8| for'movement therewith. At the opposite side of the diaphragmv |80 is a spring seat |83 slidably mounted 1n a suitable guide in the casing and engaging one end of the stem |80. Between the opposite face of seat |83 and the closed end of the casing is interposed a spring |85 for urging said seat and thereby the diaphragm |80, stem |8I, and slide valve to their normal'positions shown, this position of the spring seat being deiined by contact with a shoulder |86 in the casing.

10 The stem |8| is provided with a restricted port |81 connecting the valve chamber |68 to a groove |88 provided across the end oi the stem adjacent the spring seat |83 for supplying fluid under pressure at a restricted rate from said chamber to a chamber |89 at the opposite side of the dia.-1 phragm and from thence through openings |90 in the spring seat |83 to a chamber I9| whichcontains the spring |85.

When through port |81 the Afluid pressures on 2o opposite sides of the diaphragm |80 areequalized the spring |85 is adapted to maintain the. parts of the interlock valve device |69 -in the position shown for connecting the relay valve device |15 tothe throttlecontrol pipe |12. When fluid pressure is vented f-rom chambers |8`9 and |9I, in a manner to be later described, the fluid pressure in chamber |68 is adapted to eiect movement o the diaphragm |80 in the-direction of the lefthand until the spring seat |83 contacts a shoul- 3 der |92" in which position the slide valve |10 will close communication between valve chamber |68 and pipe |1| and connect said pipe through a cavity |93 in the slide valve to an exhaust pipe |94 for thereby suddenly releasing the actuating fluid in' the relay valve device |15 for causing op-f eration :thereof to vent the uid under pressure fromthe throttle controlxpiston chamber |63 so that the throttle cylinder piston |6| will operate to reduce thespeed of engine to idling.

0 The pressure o f uid in chambers |9| and |89 in the interlock valve device |69 is adapted to be `controlled by a poppet valve |95 located in the manual controller 41. This poppet valve is con- \tained in a chamber |96 rwhich is in constant communication through pipe |91 with chamber |9 in the interlock valve device and controls communication between said chamber and an atmospheric exhaust port |98. lA spring |99 `in chamber |96 lis provided for urging the valve |95 to its normal seated position to permit equalizaV tion of pressures on the opposite sides of the dia- -phragm |80 so that spring |85may position the parts of the interlock valve device as shown in the drawings. The poppet valve |95 has a stem 200 vwhich extends vthrough the casing and terminates below a substantially semi-circular bail 20| disposed under the. operating handle |50. This bail is fule crumed at opposite-ends on a shaft 202 secured in the casing and, as viewed in Figs. 7 and 8, it

will be apparent that the handle |50 is adapted to moveV over the upper surface of the bail in movement between its extreme position.

A button 204 projects from the lower side of the handle |50 in alignment with the upper surface of the bail 20| and the bail is provided with a vraised part 205 adapted to be engaged by said button as the handle is moved from the neutral position to the low gear drive position indicated in. Fig. 8 for rocking the bail in a downwardly direction. Another raised part 206 is provided on the bail for engagement by the button 204 as the handle is moved from low gearldrive -position to high gear drive position for also rocking the pail in adownwardly direction. In each of the operating positions of the handle |50 indicated in Fig. 8 the button 204 is adapted to be disposed either between or beyond the raised portions of the ball so that the bail may occupy the normal position shown Movement of the bail 20| in a downwardly din rection by engagement of button 204 witheither of the raised parts 205 and 206 is adapted to act through the stem 200 to unseat the poppet valve |95 for thereby venting fluid under pressure from chambers |9| and |89 inthe interlock valve device to the atmosphere through the exhaust port |98.

.The capacity of this vent communication so ex- Operation-Single vehicle Let it be assumed that handle lss of the throttle control valve device |65 is in the engine idling position shown opening the control pipe |61 to the atmosphere. As a result valve chamber |68 in 1 the interlock valve device |69 will be vented and spring |85 will be rendered operative to hold the diaphragm |80 and slide valve |10 in said device in the normal positions shown thereby venting the engine throttle control pipe |12 and branch pipe |14 connected with the relay valve device' |15 to the atmosphere through the valve Vchamber |68 and thence by way of pipe |61. With pipe |14 leading to the relay valve device |15 vented,said device will vent piston chamber |63 in the throttle control cylinder |60 in ord`er that spring |64 in said cylinder will position the piston |6| and thereby the throttle control rod |62 in the engine idling position shown. The engine I will therefore operate at an idling speed.

Let it further be assumed that handle |50 of the controller 41 is in the neutral position indicated in Fig. 8 to thereby provide the desired constant pressure of for instance fifteen pounds in the control pipe 46 connected to the selector valve device 45. The pistons 69 and 80 in the selector valve device will therefore be in their upper positions shown due to the greater opposing forces of springs 13 and 96, respectively. With the piston 69 in its upper position the valve 66 will be opened and the valve 51 will be closed so that the low gear control cylinder |1 will be opened past Jthe valve 66 to the sump passage 6| and the low gear clutch therefore disengaged.

With piston 80 in the selector valve device in its upper position shown in the drawings, the` valve 94 is seated and valve 90 unseated so that the high gear clutch control cylinder 24 is also open to the sump passage 6| and the high gear.

clutch 23 disengaged, as a result. With both clutches and 23 in the transmission device 4 thus disengaged and with the engine idling and turning the primary drive shaft 3, the low speed gear 8 will merely idle on the secondary drive shaft while the primary drive shaft will merely turn in the high speed gear 1 under which condition the secondary drive shaft 5 will be stationary as well as the drive axle 2 of the vehicle.

The fifteen pounds pressure provided in the control pipe 46 and acting in chamber |30 on the direction selector piston |20 will move same to the lower position shown due to the fact that only ten pounds pressure is required in said chamber to overcome spring |32. With piston |20 in this position the pawl |24, ratchet wheel I |1 and plug valve |05 will also` be ,occupylng' the positions` shown, in whichv a 'legend R on disk |40 will be seen through the window |46, as seen in Fig. 5,

indicating the plug valve is in condition to provide 5 for movement of the vehicle in reverse.

Let it be assumed that it is now desired to start and operate the vehicle in reverse. The operator rst moves handle |50l of the controller 41 from neutral position to the low gear drive position, indicated in Fig. 8. During this'movement the button' 204 on the lower side of the handle moves over the raised part 205 on the bail 20| vand thereby actuates the bail to unseat the valve |95. This may be of no consequence at this time s ince handle |66 of the throttle control valve device |65 should be in the idling position in which chamber |68 in the interlock valve device |69 is vented `so that opening communication between the chamber at the opposite side of diaphragml |80 past the valve |95 in the control device will not cause any change inposition of the parts of the interlock device |69.` l

In the low gear drive position of handle |50 the controller 41 operates to increase the pressure in the control pipe 46 and thereby in piston chambers |30, 8| and 10 in the selector valve device 50 from the fteen pounds provided in neutralposition of said handle to the desired higher degree such as thirty iive pounds above mentioned.

This higher degree of v pressure obtainedA in chamber |30 of the selector valve device merely -maintains piston in the lower position sho-wn so that the plug valve |05 also remains in the selected position shown and above mentioned. The increased pressure in chamber 8| on piston 80 also has no effect since spring 96v is of such force as to maintain said piston in` its normal position shown against such pressure. The thirty five pounds pressure obtained in chamber 10 and acting on the piston 69 however is adapted to move said piston downwardly against the opposing pressure of the control spring 13 to thereby seat the valve 66 and unseat the valve 51.

With valve 51 vunseated liquid under pressure from the hydraulic supply reservoir 52 is adapted to flow past said valve to passage 56 and from thence in one direction to pipe 20 leading to the low speed clutch control cylinder |1 and in another direction to the double check valve chamber- 91. The left-hand face of the double check valve 98 is thereby subjected to hydraulic pressure while the opposite face is open past the valve 90 to thesump passage 6| and as a result the double check valve will be moved to the position shown, unless -it is already in that position, for disconnecting passage 92 froml chamber V91 and for opening communication between thev passages 56 and 99. Y

Hydraulic pressure will therefore be transmit'- 60 ted from passage `56 through the passage 99 to the plug valve |05 and thence through annular groove |06 and ports |01 and |08 tothe radial ports |09, and thence through the one por@ |09 i which is in registry with passage ||0 to pipe 4| Which leads to the reverse clutch cylinder 40. i The reverse clutch cylinder is thereby operated to engage the reverse clutch 33 for securing the reverse gear 30 in the directional control device 21 to rotate with the axle`2 for moving the vehicle i in reverse when power is applied to the driving gear 28.

The hydraulic pressure applied to the low gear clutch cylinder I1 by way of pipe 20 actuates the low gear clutch to secure the low speed gear 8 to rotate with the secondary'driveshaft 5, so that rotation ofthe primary shaft 3 by the engine l will be transmitted to the secondary drive shaft 5 for turning the gear 28 and thereby the axle 2 through gear 30. l y After the engine 2 is thus connected to `,the drive axle 2 of the vehicle, handle |66 of fthe throttle control valve device |65 may be operated to increase the pressure of iiuid in the throttle control pipe |61 and thereby in the connected pipe |12 to cause operation of the relay valve device |15 to provide a corresponding pressure in the throttle cylinder |60 for effecting movement of the throttle control piston |63 away from idling position to provide a desired degree of acceleration of engine for getting the vehicle under motion. After the vehicle is started, the operator may continue the movement of handle |66 of the throttle `control valve device |65 in a direction for increasing the pressure in the throttle control cylinder |60 to increase the speed or power `of engine for in turn accelerating the vehicle.

After the vehicle speed is .increased through the low,gear drive of the. transmission v4 to a chosen degree at which it is desired to cut inthe high speed gears 1 and 9 of the transmission,

position, however, the button 204 is moved past the raised part 206 of bail so that the Dres` sure of spring |99 on the poppet valve |95 is permitted to seat said valve. Following this the 1 and slide valve |10 to their normal positions the operator merely moves the handle |50 of Y -the controller 41 from the low gear drive position to the high gear drive position indicated in Fig. 8.' As the handle |50 is thus operated, the button 204 projecting from the lower face thereoi engages the raised part 206 of bail 20| and thereby rocks sa-id bail in a downwardly direction to unseat a poppet valve |95.

When handle |66 of thethrottle .control device.

was operated for increasing the pressure in chamber |68 of the interlock valve device l |69 and therebyv on the relay valve device |15 to accelerate the engine with the low speed gears 6 and 8 in the transmission device 4 effective as just described, this pressure equalized through 'the port |81 into chambers |89 and'lBI at the opposite side of the diaphragm I 80 and the spring |85 was permitted to maintain said diaphragm and thereby the slide valve |10 in their normal positions shown since the poppet valve |95 was seated at this time'.

The unseatng of valve |95 by handle |50 as it isv moved -to high gear drive position as just mentioned, however, opens communication between the chambers |9| and |89 and the atmosphere f or venting fluid. under press'ure from said chambers at a rate exceeding the rate of supply through port |81 so as to thereby establish a sumcient diierential in pressures on the opposite sides of the diaphragm |80 to deflect same against lspring |85. This deflection of diaphragm |80 the speed of the engine to idling while changing gears. ,It w-ill thus be apparent that whenl the handle 50 is moved from the low gear drive to the high gear drive lposition, the speed of engine is automatically reduced to'idling without any operation of handle |66 of the throttle control device |65.

When the handle |50 obtains high gear drive t ss to a degree such as thirty pounds, such prest shown. With the slide valve |10 thus returned to its normal position fluid at the pressure suppliedto valve chamber |68 by the throttle control device |65 again becomesv effective through pipes |1|, |12 and |14 on the relay valve device I 15 to actuate same to supply nuidat a. corresponding pressure to piston chamber |53 in the throttle .control cylinder |160 for there- -by returning the throttle of engine I to the same position it voccupied atthe time of movement of handle |50 out of the low gear drive position.

When the hancue |50 is moved to the high gear drive position, the pressure in the control pipe 46 and thereby in chamber .|30 and passage 12 in the selector valve device 45 is also increased to the desired high degree, such as sixty-live pounds. 'I his higher pressure in the selector valvidev1ce maintains the piston |20 in its lower position and alsotends to maintain the piston 69 in its lower position. Further, .this increased pressure acts through the choke 82 to provide a. gradual increase in pressure in' chamber 8l above the piston 80. When the pressurev in chamber 8| is thus increased to some chosen degree, such as vforty-five pounds, the piston starts to move downwardly against they pressure 'of spring 96.

of a groove 2|| to disconnect same from chamber 8-3 and at substantially the same time opens a passage 2|0 to 4chamber 8|, the passage 2|0 leading to chamber 62 below the piston'69.

The piston 69 at this instant is in'its lower low gear drive position lapping passage 15.

Through passage 2|0 nuid under pressure is therefore adapted to flow from piston chamber 8| to chamber 62 and thepressure of iluid in these chambers will then increase in unison through the choke l82. When the .pressure is thus increased in chamber 62 below the piston sure acting in'conjunctlon with spring 13 on pounds, in chamber 10 acting on the opposite face of the piston and return said piston to its upper positionshown to permit seating of valve 51 and unseating of valve 66. With valve 60 unseated, the hydraulic pressure in the low gear 'clutch cylinder I1 is relieved and the low gear clutch disengaged, as a consequence.

In the upper position of piston 69 the -port 15 is uncovered vto connect thev timingreservoir 16 to chamber 62 so thatr fluid supplied through choke I82 must thenincrease the pressure in said reservoir along with that in chambers 62 and 8|. The ow capacity of port 15 is so relatedto that of choke 82 that a suiiicient pressure will be maintained in chamber 62 below the pis-,

ton'69 to hold same in its upper position. The purpose of Vconnecting reservoir 16 to chambers 12 and 8| at this time is to delay .obtaining a suicient pressure in chamber 8| to inove piston 80 to its lower positionv against spring 98 After a slight downward move, ment of piston 80, the piston laps the lower end.

until after disengagement of the low gear clutch I I, resulting from return of piston 69 to its upper position, is ensured.

When the valve 6-6 is unseated upon movement of piston 69 to its upper'position, it will be noted that both the low speed clutch cylin- Vder I1 and the reverse clutch cylinder 40 will and reservoir 16 has been increasedby flow through port choke 82 to substantially the sixtyfive pounds provided in the control pipe 46 and in passage 12 by the controller 31 in the high gear position, such pressure is adapted to move the piston 82 to its lower position against spring 96 for seating the valve 90 and unseating the valve 94. With the valve 94 unseated hydraulic pressure from the supply reservoir52 is adapted to be transmitted to passage 92 and thence in one direction through pipe to the high speed clutch cylinder 24 and in another direction to the right-hand face of the double check valve 98.

The hydraulic pressure thus obtained in the high speed clutch cylinder 24 is adapted to engage the high speed clutch 23 and connect the engine through the high speed gears 1 and 9 to the secondary drive shaft 5. The hydraulic pressure obtained on the right-hand side of the double check valve 98 is adapted to effect movement thereof to its left-hand seated position tov open communication between passages 92 and 99 so that hydraulic pressure will again be applied through the plug valve |05 to the reverse clutch .operating cylinder for actuating the reverse clutch 33 to again connect the reverse gear 30 to the drive axle 2 of the vehicle. The engine I is thereby connected to the drive axle through the high speed4 gears for causing further acceleration of the vehicle and operation thereof at a desired high speed determined by the position of handle |66 of the throttle control device |65.

'It is desired to point out that the change in transmission from low speed to high speed and the reengagement of the reverse clutch 33 is adapted to occur before the interlock valve device I69 returns from its left-hand or engine idling position to its normal position shown, so that the change in drive between the engine I and axle 2 occur only while the engine I is idling. The control by choke |81 of the recharging of chambers -I89 and |9I insures this result. It will also be noted that since movement of piston 80 to its lower or high gear drive position can not occur until the lapse of a certain period of time after .the low speed piston 69 is returned to its upper position, the disengagement of the low gear clutch I I is assured before engagement of the high speed clutch 23.

-Now let it be assumed that a condition arises where the operator desires to change the transmission from high gear back to low gear. To accomplish this he merely moves the handle of the controllerV 41 back tothe low gear drive position and during such movement effects operation of the interlock valve device |69 to automatically effect a reduction in the speed of engine I to idling. In the low gear drive position the controller 41 acts to reduce the pressure in the control pipe 46 and thereby in chambers |30 and 10 in the selector valve device 45 to the thirty-five pounds called for in said position.

As the pressure in the control pipe 46 is thus reduced the pressure in the timing reservoir 16 is correspondingly reduced by flowpast the check valve 11 and at the same time the pressure of fluid in chamber 8| above the high speed piston and in chamber 62 below the low speed piston 69 reduces by now through the choke 82 to passage 12 and through port 15 to the timing reservoir 16.

Upon a slight reduction in pressure in chamber 8| above piston 80 the spring 96 becomes effective to return said piston to its upper position for thereby unseating the valve and seating the valve 94. The hydraulic pressure in the high speed clutch cylinder 24 is thereby relieved to effect disengagement of the high speed clutch 23. At the same time, the hydraulic pressure in the reverse clutch control cylinder 40 is also relieved so that the reverse clutch 33 is disengaged.

It will be noted that the pressure of fluid in chamber 62 belcfw the low' speed piston 69'and in the timing reservoir 16 can reduce by flow past the check valve 11 only to that provided in the control pipe 46 with the controller handle 5.0 in

the low gear drive position. This reduction wil1` therefore not provide a differential of pressures on the piston 69 to cause movement thereof-to its lower position. However, when the piston 80 obtains its upper position the groove 2 II is opened to chamber 83 and thence to atmosphere through the vent port 84 so as to provide for further and complete venting of fluid under pressure from chamber 62 below the low speed piston 69 and from the timing reservoir 16.

As before mentioned a differential lof pressures on the low speed piston 69 of substantially thirtyfive pounds is required to effect movement thereof to its lower position against the spring 13, and

this differential will be obtained when the pressure of fluid in chamber 62 becomes substantially equal to that of the atmosphere by venting through the groove 2| I, and when this condition is obtained the control pipe pressure in chamber 10 will move the piston 69 to its lower position for seating the valve 66 and unseating the valve 51.

With the valve 51 thus unseated, liquid finder pressure will again be supplied to the low gear cylinder I1 to operate the low gear clutch II for thereby rendering the low speed gears 6 and 8 in the transmission device 4 effective to transmit power from the primary drive shaft 3 to the secondary shaft 5. At the same time the reverse cylinder 40 will be also operated again to connect the reverse drive gear 30 tothe axle 2 so that the engine I may apply power to the axle through the low gear drive.

At substantially the time the engine is again connected to the axle 2 through Athe low gear clutch I I the interlock valve device will be returned to its normal position-for returning the throttle control piston |63 to the position occupied priorto initiating the shifting operation.

It is of course understood that after any shifting operation Vhas occurred,` the throttle control valve handle |66 may be readjusted to suit operating conditions or the desire of the operator. However, the interlock valve device |69 precludes any need for the operator to turn the throttle control valve handle |66 back to idling position each time he changes the drive in the transmission, as will be apparent.

Whenever the operator desires to disconnect the engine I from the axle 2 in order for instance to stop the vehicle, he moves the handle |50 of the sump passage 6|.

aaneen This reduced pressure acting on piston |20 in` the selector valve will however maintain it in its lower position shown, but regardless of previous positions of the high and low speed selector pistons 80 and 69 the springs 96 and 13 will return same to their upper positions against said pressure acting in the chambers 8| and 10. With these pistons in their upper positions both valves 90 and 66 are unseated so that both the high and low gear clutch cylinders 24 andV I1, respectively, as well as the reverse cylinder 40 are open to the in the transmission device4 will be disengaged to disconnect the engine drive shaft 3 from the O secondary drive shaft 5, and both clutches 32 and 33 in the directional control device 21 will also be disengaged, so that the engine will be disconnected from the axle 2 to permit stopping of the vehicle.

Whenever it is again desired to operate the vehicle the handleV |50 of the controller may again be turned from the neutral position to the'low gear or high gear positions asdesired and selector device 45 will again operate automatically as hereinbefore described.

It win be noted .that the piston lzownieh con-- trols the plug valve |05is heldin its lower position and that the position of the plug valve itself is not changed during the operation above de-- scribed. In other words as long as the control pipe 46 is maintained charged with fifteen pounds pressure the directional control piston and plug valve |05 will remain in la position providing for a selected direction of vehicle movement. l

j In case it is desired t0 operate -the vehicle in the opposite or -forward direction it is necessary for the operator to move the handle |50 from the neutral position to the reverse position defined by contact with shoulder |52 for effecting substantially complete venting of uid under pressure from the control pipe 46 and piston chamber in the selector valve device 45. When the pressure in chamber |30 is thus reduced to below a certain degree such as ten pounds the spring |32 becomes the predominate force on piston |20 and effects Amovement thereof in an upwardly Thus both clutches and 23 high gear drive positions the hydraulic fluid supplied past the double check valve 90 to passage 90 will be applied through pipe 38 to the forward clutch cylinder 31 -to effect operation of clutch 32 to connect the forward gear 29 with the axle 2 whereby upon operation of the transmission device 4 to connect the engine l with said gear the vehicle will be moved in a forwardly direction. Except for this one difference the entire mechanism will operate in response to operation of the control handle, |50'in thesame manner as when the cock` |05 was positioned vto provide reverse v movemeritpf the vehicle.

When itis again desired to operate the vehicle in the reverse direction, it is only necessary to move the controller handle- |50 tothe reverse p0- sition for thereby reducing the pressure in the control pipe 46 to\\substantially that of the atmospherein order to permitthe piston |20 to again be moved toits upper position 'by spring |32 for turning-'the plug valve |05 another fortyflve degrees` to:y reverse the fluid connections between the'plpes38 and 4 leading tothe directionalcontrol clutch "cylinders 31 and 40. When the contrlpipe pressure is again increased upon movement of the handle |50 to neutral Aposition the piston |201 will again return to the lower positionlshown.j.Each forty-five degrees rotation of the plug valve |45 will reverse the fluid connections between the pipes 38 and 4|, and hence the four cross ports |09 and four intermediate vent ports |2; located forty-five degrees apart.

The depth of theright-hand side wall of notch |54 in .the quadrant |5|, as viewedin Fig. 8, as well as'the depth of notches|55 and |56 is'such that the handle |50 may be readily moved between the neutral and low -gear and high gear positions, the several notches merely acting'to indicate to the operator when the desired position of the handle is obtained. The portion of the quadrantbetween the left-hand wall of notch |54 and shoulder |52 is however formed at a greater radius than the portion at the opposite side of notch |54 thereby 'providing a deeper shoulder at the left-hand side of notch |54, as viewed in Fig. 8, for engagement .by the handle detent |51. :.By this structure a greater degree of manual force is required on the handle |50 to move same from the'neutral position to the reverse position, the purpose being to prevent the operator from unintentionally effecting such movement.

It is understood that while a vehicle is operating there may be an unintentional loss of presward clutch cylinder pipe 38 is disconnected from a vent port ||2 and placed in communication with a hydraulic supply port |09 vso as thereby j sure in control pipe 46 due possibly to rupture thereof or /to failure of a connector 44 at an end of the pipe. Such loss of pressure will result in the piston |20 moving to its upper position and thereby operating the cock |05 to reverse the connections between the directional control cylinders 31 and 40. It would of course be undesirable to throw the locomotive or vehicle in relA verse gear while the high or low gear clutch in the transmission 4 is in engagement. Such undesired operation is howeverprevented since the relatively great force of springs 13 and 96 'acting on the low and high speed pistons 69 and 80 will move same to their upper positions fordlsconnecting the engine from the secondary drive shaft 5 before. therelatively low force of spring |32 acting on the piston|20 can effect operation thereof and thereby of the cock |05 to reverse the connections to the forward and reverse control cylinders 31. and 40.

A handle guard '2|3 issecured to the quadrant and has aslot 2l4 extending rparallel to the plane of the quadrant through which the handle |50 is' adapted to be moved to its different controlling positions, as shownVv in Figs. 1 and 7. The guard 2|3 alsolhas an opening-.H5 connecting the slot 2 |4 to the top of the guard, this opening being of suicient width and so located that in neutral and handle-off-position of handle |50, the handle may be lifted vertically, as viewed in Fig. 7, and removed vfrom the controller.

The throttle control device |65 also has a handle guard 2|5 which provides for removal of handle |65 only in engine idlingposition.

By providing the guards 2|3 and 2|6, the operator may remove the handles |50 and |65 and take .them with him in case he has to leave the vehicle for any reason, so as to thereby prevent malicious or unwarranted operation of the power .V land* drive systems .of the vehicle while he is absent.

Operation-two coupled vehicles As before mentioned, both of the control pipes |12 and 45 extend to both ends of the vehicle or locomotive for connection with corresponding pipes ona second locomotive in case it is desired to operatetwo together.

Under such a condition the cock 49 in branch pipe 48 on the second or non-controlling locomotive will be closed to disconnect the control pipe 46 from the controller 41 so as tov thereby ensure that the pressure in control pipe will be varied only in response to operation of handle |50 on the controller 41 of the leading locomotive. For a like reason a cock 2|2 is provided in pipe |61 leading to the throttle control valve device |55 and this cock is also closed` on the non-control locomotive.

With the equipment on the two locomotives .thus connected together and the cocks 49 and 2 2 on the non-control locomotive both closed, the selector valve devices 45 on the .two locomotives will operate in unison in response to variations in the pressure in the control pipe 46 effected by operation of the controller 41 on the control locomotive to provide on both locomotives the same cntrol between the engine and axle 2 as hereinbeiore described for the single vehicle. Likewise the relay valve devices |15 and throttle cylinders |60 as well as the interlockv valve devices |59 on the two locomotives will operate in unison in response to variations in pressure in the pipe |12 as controlled by the throttle control valve device |65 on the control vehicle, as will be apparent. Y

At the time of coupling two vehicles together for double heading and operating in unison under the control of theA controllers 41 and |65 on lone locomotive, it will be noted that the directional control cock |05 on one locomotive may be adjusted to provide for ymovement of that locomotive in one direction, while the said cock on .the other locomotive maybe adjusted to provide for movement in the opposite direction. lThis of course would be -undesirable but is adapted to be corrected by the 4'operator' inserting-,key |48 in the bore |41 at the right hand side of .opening |44, as lviewed'in Fig. 5, in one of the .selector valve devices 45 and `then turning said key and thereby the cock to a position in which the key engages the shoulder |45 at the opposite end of the opening |44. The key |48 is` then removed `and the locomotives, While remaining coupled,

will then operate in unison.

In case the front end of one locomotive is coupled to the rear end of the other locomotive the same legends F or R will appear in the Windows |46 of the two selector valve devices 45, when conditioned to provide synchronous Yoperation but it should be notedthat in case the front ends or rear ends of both locomotives are coupled together, the legend F will be visible on `one locomotive and the legend R on the other locomotive when the two selector valve devices 45 are adjusted to provide synchronous operation.

Summary It will now be apparent that there has been provided an improved control system for a selective speed gear transmission and a forward and reverse directional control mechanism of a'vehicle which is relatively simple in construction, yet positive in operation. Each change in the vehicle drive is dependent upon the establishment of a distinctly different degree of fluid pressure and each different degree of pressure is positively obtained merely by moving the handle of l a manual control deviceto a selected position. In each position of the manually control device it will be apparent that only the desired operation will occur since all other operations are dependent Vupon the establishment-of different degrees of control pressure which are obtainable only in distinctly different positions of the manual control device. e

The system is particularly adapted for remote control of devices such as a selective gear transmission and a forward and reverse directional control mechanism and for the unified operation of a plurality of such devices connected to a common control pipe.

The interlock provided between the engine throttle control and the transmission control provides for automatically reducing the speed of the engine to idling while effecting a change in gear and then bringing the speed of the engine back to that existing before such change, to thereby insure the proper operation of the throttle at the time of effecting a gear change without attention on'the part of the operator. In addition, this automatic throttle control relieves the operator to a certain degree of tiring manual effort in cotnrolling the vehicle.

Having now described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. A fluid pressure control mechanism for selectively controlling the operation ofA a pluralityof different vdevices comprising a control pipe, three movable abutments subject on one face to the pressure of fluid in said control pipe,

. selectively establishing in different positions the different degrees of iluid pressure in said pipe required for effecting movement of each of said abutments from normal position.

2. A huid pressure control mechanism for selectively controlling the operation of a plurality of different devices comprisinga control pipe, a manually operative device for selectively tion for providing a. certain degree of pressure in establishing in said pipe one or another of a plurality of different degrees of fluid pressure, and a selector valve device operative in accordance with said different degrees of fluid pressure for selectively controlling said devices, said selector valve device comprising a spring, a movable abutment subject to the opposing pressures of said spring and the fluid in said pipe and movable from a normal position on the establishment of a certain degree of fluid pressure in said pipe, another spring, another movableabutment subject to the opposing pressures of the last named spring and the pressure of fluid in said pipe and movable f rorn anormal position upon establishment of a higher degree of fluid pressure in said pipe, a third spring, a third movable abutment sub-ject tothe opposing pressures o-f said third spring and they pressure of fluid in said pipe and movable to one position upon the establishment of a pressure in said pipe which is lower than required for moving the rst named abutment from its normal position and being movable to another position upon a reduction in such lower pressure, valve means operative by movement of each of the rst two named abutments from their normal positions for effecting operation of one of said devices, and valve means for controlling another of said devices operative by the third named abutment upo-n said reduction in said lower uid pressure thereon,

3. A fluid pressure control mechanism for selectively controlling theoperation of a plurality of devices comprising a control pipe, manually operative means having oneposition for establishing a certain degree of fluid pressure in said pipe, another position for establishing a different degree of fluid pressure in said pipe, and a third position for establishing a still different degree of fluid pressure in said pipe, a spring, a movable abutment subject to the opposing pressure of said spring and'of the fluid in said control pipe and adapted to be maintained in said normalposition'by said spring when said manually control device is in said'rsr named position and adapted to be moved out of said normal position by the pressure of fluid established in said pipe upon movement of said manuallyoperative device to its lsecond named position, a second spring, another movable abutment subject to the opposing pressures of said second spring and fluid in said control pipe and adapted to be maintained in a normal position by the pressure of said second spring against the pressure of fluid established in said pipe in the two first named positions of said manually operative device and being movable out of said normal position by the pressure of fluid established in said pipein the third named position of said manually operative device, the last named abutment being operative upon initial movement from its normal position to reduce the pressure diierentialon the rst named movable abutment for rendering the spring acting thereon4 operative to return-same to said normal position,

valve means operative by the first named abutment upon movement from its normal position for controlling one of said devices, and valve means operative by movement ofthe second named abutment after said initial movement thereof for effecting operation of another of said devices.

4. A fluid pressure control mechanism for selectively controlling the operation of a plurality of difiere t devices comprising a control pipe, manually oxerative means having one posidegree of fluid pressure in said pipe, la spring,

a piston subject on one face to pressure of uid in said pipe and on its opposite face to the pres- .sure of said springand being movable from a normal position by the pressure of fluid established in said pipe in the second named position of said 'manually operative means, another spring, another piston subject in a chamber at one face to the pressure of fluid in said pipe and on the opposite face to the pressure of the second named spring and being movable from a normal position only upon establishing said higher fluid pressure in said pipe, a choke in the communication between said chamber and pipe for retardingthe increase in pressure on said last named piston upon movement of said manually operative means to its last named position, the last named piston being operative upon a certain initial movement from its normal positionA to connect said chamber to the spring side of the first named piston forA supplying fluid under pressure thereto to reduce the pressure differential on the first named piston for thereby rendering the first named spring operative to return the first named ,piston to its norm-al position, a timing volume, the first named piston being oper-- ative upon return to its normal position to connect said volume to said chamber to delayA obtaining on the second named abutment the pressure of fluid provided in said pipe in the third named position of said manually operative means, valve means for controlling one of said devices operative upon movement of the first named piston from its normal position, and other valve means for controlling another ofv said devices operable upon movement of said second named piston after the 'said certain initial movement thereof.

5. A fluid pressure control mechanism for selectively rendering either a high or a low gear drive connection effective between an .engine and a Adrive axle of a vehicle comprising a control pipe, a manually operative device having a normal position and being movable `therefrom to one operating position for establishing a certain degree of fluid pressure in said pipe and to another operating position for establishing a different degree of fluid pressure in said pipe, a spring, a

movable abutment subject to the opposing pressuresof said spring and of uid in said control pipe and having a normal position for rendering said low'gear drive connection ineffective and being movable from `said normal position to 'render said low drive connection effective upon establishment of the fluid pressure in said pipe provided in the second framed position of said manuarl control device, a second spring, a second movable abutment for controlling said high gear drive connection and having a normal position for rendering same ineffective and being movable from the normal position to render the high gear drive connection 4eilective, saidk second abutment being subject to the opposing pressures of said second spring and the pressure of fluid in a chamber connected to said pipe through a choke and being movable from said normal position upon establishment in said chamber of the fluid pressure provided in said pipe in the third named position of said lmanually operative device,v and normal position and prior to renderingsaid high gear drive connection effective to effect movement of the rst named abutment to its normal position.

6. A fluid pressure control mechanism for selectively controlling a' high and low gear drive connection between an engine and a drive axle of a vehicle comprising a low gear control element operative when subject to hydraulic pressure to render said low gear drive connection effective, a high gear control element operative when subject to hydraulic pressure to render said high gear drive connection effective, a control pipe, means operative upon establishment of a certain degree of fluid pressure in said control pipe to subject said low gear element to hydraulic pressure, means operative upon establishment of a higher degree of fluid pressure in said control pipe to effect operation of the rst named means to relieve the hydraulic pressure on said low gear element and to subject said high gear element to hydraulicpressure, and a manually operative device having two different positions for selectively establishing said different degrees of fluid pressure in said control pipe and a third position for establishing a still different degree of pressure in said control -pipe to render both of said means operative to relieve the hydraulic pressure on said low and high gear elements.

7. A fluid pressurecontrol mechanism for selectively controlling a high and a low gear drive connection between an engine and a drive axle of a vehicle comprising a control pipe, a manually operative device having a normal position to provide a certain pressure in said pipe, and being movable therefrom to another position for providing -a certain intermediate pressure in said pipeand being movable to a third position for providing a still higher pressure in said pipe, a piston for controlling said low gear drive connection subject on one face to the uid in said pipe, a spring in a chamber at the opposite side of said piston and acting thereon in opposition to the pressure of fluid in said pipe and providing for movement of said piston from said normal position by said intermediate pressure to render said low gear drive connection effective, another piston subject to the pressure of fluid in a second chamber connected to said pipe through a choke, a spring acting on the last named piston in opposition to the pressure of fluid thereon and providing for movement thereof from a normal position upon an increase in pressure in said second chamber through said choke to said higher degree to render said high gear drive connection effective, means controlled by the second named piston and operative upon preliminary movement thereof from normal position to connect said second chamber to lthe first named chamber to provide for flow of uid under pressure to the first named chamber to reduce the differential of fluid pressures on the first named piston for rendering the spring acting thereon effective to return same to its normal position, a timing reservoir connected to said chambers by said first named piston in its normal position for delaying the increase in pressure on the second named piston through said choke, the second named piston in its normal position opening communication between thechamber at the spring side of the first named piston and the atmosphere and being operative to close said communication upon initial movement from its nor'- mal position. A'

8. A fluid pressure control mechanism for selectively controlling a high and a low gear drive connection between an engine anda drive axle of a vehicle comprising a control pipe, a. manually operative device having a normal position to prov and acting thereon in opposition to the pressure Y of fluid in said pipe and providing for movementv of said piston from said normal position by said intermediate pressure to render said low gear drive connection effective, another piston subject to the pressure of fluid in a second chamber connected to said pipe through a choke, a spring acting on the last named piston in opposition to the pressure of fluid thereon and providing for movement thereof from a normal position upon an increase in pressure in said second chamber through said choke to said higher degree to render said high gear drive connection effective, means controlled by the second named piston and operative upon preliminary movement thereof .from normal position to connect-said second chamber to the first named chamber to provide for flow of fluid-under pressure to the first named' chamber to reduce the differential of fluid pressures on the first named piston for rendering the spring acting thereon effective to return same to its normal position, a timing reservoir connected to said chambersl by said first named piston in its normal position for delaying the increase in pressure on the second named piston through said choke, the second named piston in its normal position opening communication between the chamber atthe spring side of the first named piston and the atmosphere and being operative to close said' communication upon initial movement from its normal position, said timing reservoir havinga connection with said pipe, and a check valve in said connection providing for flow of fluid under pressure only in the direction of said reservoir to said pipe.

9. A fluid pressure control mechanism for selectively controllingrthe operation of two hydraulically operated devices comprising in combination'with a source of hydraulic pressure, a control pipe, a manually operative device for selectively effecting the establishment of either of two different control pressures in said pipe and a third and lower pressure in said pipe, valve means movable from a normal position for rendering one of saidvhydraulic devices operative, a spring, a movable abutment subject to the opposing pressures ofsaid spring and of fluid in said pipe and responsive to the lower of said two control pressures for effecting movement of said v valve means.from normal position, othervalve means movable from a normal position for rendering the other of said hydraulic devices operative, a second spring, another movable abutment subject to the opposing pressures of said second spring and of fluid pressure in said pipe and operative upon establishment of the higher of said two pressures therein to effect movement of last named valve means from normal position, and means controlled by the last named abutv ment` and operative thereby prior' to effecting movement of the last named valve means from normal position to effect operation of the first named abutment to return the first named valve means to normal position.

10. A fluid pressure control mechanism for selectively controlling the operation of a plurality of pressure responsive devices comprising a. casing having a passage through which fluid under -pressure 'is adapted to be supplied for operating and ratchet means associated with said valve and operative upon a variation in pressure in .said control pipe to turn said valve from one of its positions to another, manually operable means said devices, each `of said devices `having an varied, manually operable means for `varying the pressure in said control pipe, and means responsive to a variation in pressure in said control pipe to turn said valve throughan arc adapted to reverse the connections between said actuating pipes and passage.

1l. A fluid pressure control mechanism yfor selectively controlling. the operation of a plurality of pressure responsive devices comprising a casing having a passage through which iluidunder pressure is adapted to be supplied for operating said devices,` each of said devices having an actuating pipe connected to said casing, a rotatable valve in said casing arranged to control communication between said passage and the actuating pipes and operative upon rotation to alternately connect first one of said actuating pipes to said passage and then the other of said actuating pipes to said passage, a control pipe, means conditionable upon an increase in pressure in said control pipe for turning said' valve upon a reduction in pressure in said. pipe through an arc for reversing the connections between said actuating pipes and ysaid passage, and manually operable means for eliecting variations in pressure in said control pipe.

12. A fluid pressure control arrangement for selectively controlling the operation of two pressure operated devices comprising a. control pipe and a valve device having a casing through which fluid under pressure isadapted to be supplied for actuating said devices, an actuating pipe connecting each of said-devices to'said casing, and a rotatable valve in said casing operative upon rotationvthrough a plurality of different positions to alternately open first one of Asaid actuating ing pipe to said passage, a pawl and ratchet for .turning said valve, and means operative upon an increase in pressure in said control pipe to condition 'said pawl and ratchet to turn said valve ona reduction in pressure in said control pipe through an arc suicient to eiect reversal of the connections of said actuating pipes with said passage, and a manually operable device having positions for increasing and decreasing the pressure of duid in said control pipe.

13. A fluid pressure control arrangement for two pressure controlled devices comprising a pressure -control pipe, a valve device having a duid supply passage through which fluid under pressure is Aadapted to be supplied for operating said devicesand having other passages connected to each of said devices, a rotatable valve arranged to control communication' between said passages and rotatable toa plurality of positions equally spaced around a circle for establishing in each alternate position communication between said supply passage and one ofl said devices and in the otherpositions communication between said supply passage and the other of said devices, pawl for effecting variations in pressure in said control pipe, and an indicating device conditionable upon positioning of said valve for indicating which of said devices is connected to said supply PaS-Sage.

14. A fluid pressure control arrangement for two pressure controlled devices comprising a pressure control pipe, a valve device having a ud supply passage` through which iluid under pressure is adapted to be supplied for operating said devices and having other passages connected lto each oi said devices, a rotatable valve arranged to control communication :between saidl passages andv rotatable to a plurality of positions equally spaced around a circle for establishing in each alternate position communication between said supply passage and one ofv said devices and in the other positions communication between said supply passage and the other of said devices,

pawl and ratchet means associated with said valveand operative upon a Variation in pressure n said control pipe -to turn said valve from one of its positions to another, manually operable means ior eiecting variations in pressure in said control pipe, and means operative manually to also turn said valve from one position to another.

15. A fluid pressure control arrangement for two pressurel controlled devices comprising a pressure control pipe, a valve device having a :duid supply passage through which duid under pressure is adapted to be supplied fork operating said devices and having other passages connected to each of said devices, a rotatable valve arranged to control communication between Said passages and rotatable to a plurality of. positions equally spaced around a circle for establishing in each alternate position communication between said supply passage and one of said devices and in the other position communication between said supply passage and the other of said devices, pawl and ratchet means associated with said valve and operative upon a variation in pressure in said control pipe to turn said valve from one of its .positions to another, manually operable means for eiecting variations in `pressure in said control pipe, and an indicating device secured to rotate with said plug valve and having alternated spaced legends thereon indicating the two said devices, and means ar ranged to mask all of said legends except one indicating the device connected to said supply passage in each position of said valve.

16. A system for controlling the power transmission between a drive engine and anaxle of a. vehicle comprising forward directional control means operative to provide a drive connection between the engine and axle to propel the vehicle in a forward direction, reverse directlonal control means operative to provide a drive connection between said engine and axle to propel said Avehicle in a reverse direction, transmission control means for connecting and .disconnecting said engine from said forward control means and said reverse control means, a :duid pressureA control` pipe, means operative upon an increase in pressure in said pipe to a certain degree and upon a subsequent reduction in pressure in said pipe to render said forward directional control means effective and upon another increase in` pressure in said pipe to said certain degree and a subsequent reduction in such pressure to render said reverse control means effective, another means controlled by the pressure of ,uid in said pipe for controlling said transmission means and operative when the pressure in said pipe is increased to a degree exceeding said certain degree to render said transmission means effective and when less than the last named degree ineifective.

17. A system for controlling power transmission between a drive engine and axle of a'vehicle comprising forward directional control means operative to provide a drive connection between said engine and axle. to propel the vehicle in a forward direction, reverse directional control means operative to provide a drive connection between said engine and axle to propel the vehicle in a reverse direction, transmission means for connecting and disconnecting said engine from said forward and reverse directional con;-

trol means, a control pipe, means operative upon an increase in pressure in said control pipe to a certain degree and'upon a subsequent reduction in such pressure toselect said forward directional. control means for operation and upon another increase in pressure in said pipe' to said certain degree and a subsequent reduction therein to select said reverse directional control means for operation, and means upon an. increase in said pressure in said pipe to a degree higher than said certain degree to eiIect operation of both said transmission means and lthe selected directional control means for connecting said engine with said axle, the last named means beingv operative when the pressure in said pipe isless than said higher pressure to effect operation of both said transmission means and the selected directional control means to break the drive connection between said engine and axle.

18l `A system for selectively controlling a high gear drive means, a low gear ldrive means, a forward directional control means, and a reverse directional control means in a power transmitting connection between an engine and drive .axle of a vehicle, said system comprising a control pipe, selector means operative upon an increase in pressure in said pipe toa certain degree and a subsequent reduction in pressurey in said pipe below said certain degree to select said forward directional control means for de-v termining the direction of vehicle movement,

means operative upon an increase in pressure in said control pipe to a greater degree than said certain degree to render said low gear drive means effective, other means operative upon a further increase in pressure in said control pipe to a still higher chosen degree to nrst render' said low'gear drive means ineffective and then said high gear driveA means effective, the two to determine the direction of vehicle movement..

19. A system for selectively controlling a high gear drive means, a low gear drive means, aforward directional control means, and a reverse directional control means all located in the power transmitting connection between an engine and.

a drive axle of a vehicle, each ofsaid means beingeffective upon the application of pressure thereto and ineffective upon the release of such pressure, said system comprising a control pipe, a device having a pressure passage, actuating pipes connecting said forward and reverse control means to said device, a valve contrplling commu.

nication between said pressure passage and actuating pipes and having a plurality of equally spaced pressure ports in constant communication with said pressure-passage and so arranged as to alternately connect said passage first with one of said actuating pipes and .then with the other upon certain increments of rotation of said valve, said valve also having a plurality of non-pressure ports alternated with said `pressure ports and adapted to either register with one or the other of said actuating pipes whichever is disconnected from said pressure ports, means controlled by the pressure of fluid in said control pipe and operative upon an increase therein to a certain degree and a subsequent reduction in such pressure to turn said valveto a position for connectingv one of said actuating pipes to one of said pressure ports and the other actuating pipe to one of said non-pressure ports and operative upon another increase in pressure in said pipe to said certain degree followed by a reduction in such pressure to reverse the connections between said actuating pipes and said pressure and non-pressure ports, means operative upon an increase in pressure in said control pipe to a chosen degree exceedingv said certain degree to supply uid under pressure to said supply passage and to said low gear drive means, other means operative upon an increase in pressure in said control pipe to a still higher chosen degree torender said low gear drive means ineffective and to then supply fluid under pres- V sure to said pressure passage and to said high gear drive means, and a manually operative device movable to differentl positions'to provide the different degrees of uid pressure in said control Apipe required for controlling said high aandlow Afor controlling the power of said engine and movable to an engine idling ,position when vvoid of iiuid under pressure 'and Vfrom said idling position to other positions dependent upon the pressure of fluid therein for providing lvarious degrees of power or speed of said engine, a manual throttle control valve operative to vary the'pressure of p uid in said throttle adjusting means, a manual said one position to 'another position for rendering saidfhigh 'speed device eiective, and means associated with. saidmanual controller and voperative automatically upon movement thereof between its different positions tovent uid under pressure'froni said throttle adjusting means, the

lastnamed means providingfor .the control of the fiud in saidadjusting means bysaid throttle control valve only' when said manual controller is in its two positions.

21.In combination, a high and low speed device,v selectively operativefor transmitting powerfrom .an internal-combustion engine to a drive axle ofthe vehicle, a manual controller for controlling saidhigh and low speed devices and having one position for effecting operation thereof to disconnect saidengine from said axle, said manual controller being movable from said one position to a second position -for rendering said low speed device effective and to a third position for rendering said high speed device effective, a throttle cylinder for controlling the speed or power of said engine andoperative when void of .iluid under pressure to provide an idling speed oi.'

said engine and when supplied withfluid under pressure to vary the power or speed of said engine in accordance with the degree of pressure ofsuch iluid, a manually operative throttle control valve for varying. the pressure of huid in said throttle4 cylinder, means associated with saidmanual controller rendering said throttle valve ellective to vary the pressure in said throttle cylinder when said controller is in any one of its positions and operative to vent fluid under pressure from said throttle cylinder upon movement of said controllerl between each of its diierent positions, and

means operative subsequent to the' venting of uid under pressure from said throttle cylinder by operation of said manual controller in movingfrom one position to another to delay the resupply of fluid under pressure thereto from said throttle control valve. l

22. In combination, a selective gear transmission device operative to provide various drive connections between an internal combustion enginev and the drive axle of a vehicle, a uid 'pressure controlled throttle cylinderfor` governing the throttle position on said' engine and movable to an idling position when void of fluid under pressure to provide for operation of said engine at an idling'speed and movable from said idling position to various other positions depending upon the pressure of iiuid supplied thereto to provide various degrees oi power or speed of said engine,

a manually operative throttle control yalve movable to various positions to provide diierent degrees of pressure in said throttle cylinder, a. man-4 ually voperative controller movable to different positions for selectively controlling the gear drive in said transmission device, an'interlock valve controlling communication through which iluid under pressure is suppliedl to 'said throttle cylinder from said throttle control valve and having a normal position opening same and movable to another position for closing said communication, andv for venting the iluid under pressure from said throttle cylinder, and means associated with said manual contr raller controlling said interlock valve and operative upon movement' of said controller between itsvr different positionsto eiect operation of said interlock valve 'to vent uid vunder pressure vfrom said cylinder and in its different positions providingfor operation of said interlock'valve to open said communication between said cylinder and said throttle control valve, and means for delaying the operation of said interlock valve to open the communication controlled thereby subsequent to the closingof said communication yby the operation of said manual controller.

2.3. In combination, a selective high and low speed gear transmission device for providingvyarious drive connectQIls between an internal combustion engine and an axle o f a vehicle, a` uid.

controlled throttlecylinder for controlling .the speed or power of said engine and havingan idlingposition to provide for operation of said engine at idlingspeed and movable therefrom to Ia. plurality of .diierent positions depending upon the pressure of iluid in said cylinder toprovide various degrees of speed or power of said. engine, a throttle control v alve operative manuallyto vary the pressure of fluid in said cylinder, an

interlock valve devicecontrolling communication between .said cylinder and throttle control valve communication and for venting said throttle cylinder to the-atmosphere, .said interlock valve device comprising a movable abutment subject on one side to the pressure of iluid supplied by said throttle control device and on the opposite side to pressure of fduid in a chamber supplied with iluid under pressure from said throttle control device at a restricted rate, a spring in said vchamber acting on said abutment for urging same to a position for opening said communication when the pressure of fluid on the opposite sides of said abutment are substantially equal, said abutment being 'operative upon the venting of uid under pressurefromsaid chamber to effect closure of said communication, a manual controller -movable to one operating position .to render said low speed geardevice effective and. to another oper- .Y

. bustion engine and an axle of a vehicle, a fluid controlled throttle cylinder for controlling the speed or power of said engine'and having an idling position toprovide for operation of said engine at idling speed and movable therefrom to a plurality of different positions depending upon the pressure of uid in said cylinder to provide vvarious degrees vof speed or power of said engine,

a throttle control valve operative manually to vvary the pressure of ud in said cylinder, an interlock valve device controlling communication between said cylinder and throttle control valve and having a normal position opening said communication and another position for closing such communication and for venting said throttle cylinder to the atmosphere, said interlock valve device comprising a movable .abutment subject on one side to the pressure of iluid supplied by said throttle control device andgon the opposite side to pressure oi' fluidin a chamber supplied with fluid under pressure from said throttle control device at a restricted rate, a spring in said chamber acting on said abutment for urgingsame to a position for opening said communication when the pressure of fluid on the opposite sides of said abutment are substantiallyequal, said abutment being operative upon the venting of iiuid under pressure 'from saidA chamber to eilect closurel of saidcommunication, a manual controller for selectively controlling said high and low speed gear and comprising 'a handle having a normal position for rendering both of said gears ineffective' and being movable therefrom'to another position for rendering saidlow speed gear effective and to still'another position for 'rendering said Ahigh speedgear effective a valve in said manu,

ual controller operative when unseated to vent ,liuid under pressure from said chamber, and

means associated with said manual controller .a rigid substantially semicircular 25. In combination, a selective high and low speed gear transmission device for providing various drive connections between an internal combustion engine and an axle of a. vehicle, a fluidl controlled throttle cylinder for controlling Athe speed or power `of said engine and having an idling position to provide Vfor operation of said engine at idling speed and movable therefrom to a pluurality of different positions depending. upon the pressure of fluid in said cylinder to provide various degrees of speed or power of said engine,

a throttle control valve operative manually to .vary the pressure of fluid in said cylinder, an influidunder pressure from said throttlecontrol I device at a restricted rate, a spring in said chamber acting on said abutment for urging same to a position for opening said' communication when the pressure of fluid on the opposite sides of said abutment are. substantially equal, saidabutment being operativeupon the venting of fluid under pressure from said chamber to effect closure of said communication, a manual controller for controlling said high and low speed gears and comprising a handle rotatable manually in a certain plane, said handle having one position for rendering both of said speed gears ineffective and being movable therefrom to another position for rendering saidA low speed gear effective and to still a third position for rendering said high speed gear effective, a valve associated with said manual controller loperable when unseated to vent v fluid under pressure from said chamber, and an element engageable by said handle during Amovement between its different positions for unseating said valve, said. element providing for the seating of said valve when said handle is in its different position,

26. A manually operative control device cornprising a casing, a handle mounted thereon and 'adapted to be turned relatively to said casing in a certain planeto different operating positions, element hinged to said casing for rocking movement in a direction at right angles to said plane, said elemont having raised parts engageable by said handle upon movement between its different positions for effecting rocking of said element from said normal position, said element having recesses between said raised parts providing for return of said element to itsnormal position in each of of said handle positions, and means for uiging said element to. said normal position;

'27. A control apparatus for selectively controlling two different drive connections between a V prime mover and a member .to be driven by said prime mover comprising a control pipe, means subject to pressure of fluid in s'aid pipe and operative upon establishment of a'certain degree of fluid pressure 'in said pipe to provide one of said drive connections and upon a lesser degree of pressure to .break said one drive connection, other means subject to pressure of lfluid in said pipe and operative upon establishment cf a certain greater degree of fluid pressure in said pipe to4 effect operation of the first named means to break the drive connection controlled thereby `and to make the other of-.said drive connections and upon Aa lesser degree to break said other drive connection, and a manually operative device selectively operative to provide either of said degrees of fluid pressure in said pipe or a pressure lower than said lesser degree for effecting operationof both of said means to break the drive connection controlled thereby.

28. A fluid pressure control mechanism for alternating the operation of a plurality offluid pressure responsive devices comprising a casing having a passage in which the pressure of fluid is adapted to be varied for controlling said devices, a valve in said casing having positions corresponding in number to the number of said devices and operative upon movement first to one and then to another of said positions to connect said passagerst to one of said devices and then another for alternately rendering the connected device controllable from said passage and for rendering the disconnected device-non-operable, means operable upon a variation in fluid pressure to move said valve from one of its positions to another, and manually operable means for effecting variations in fluid pressure on said means.

29. An apparatus for controlling the operation of a clutch arranged to connect and disconnect a prime mover to and from a member to be driven and for also controlling the power output of said prime mover comprising, in combination, meansoperable upon supply of fluid under pressure to a clutch control pipe to effect engageable to vary the fluid pressure in said motor, andl means operable upon operation of 'saidclutch lcontrol means to release lfluid under pressure from said clutch control pipe to reduce the pressure in said motor to substantially atmospheric pressure.

30. An apparatus for controlling the operation of a clutch arranged to connect and disconnect a prime mover to and from a member to be driven and for also controlling the power output of said prime mover comprising, in combination, means operable upon supply of fluid under pressure to a clutch control' pipe to effect engagement of said clutch and upon release of fluid' under pressure from said pipe tov effect disengagement of said clutch, clutch control means operable to effect a supply of fluid under pressure to and its release from said pipe, a motor operable by fluid under pressure to adjust the power output of said prime mover in proportion to the pressure lof fluid in said motor and to provide for a chosen reduced output of said prime mover when the pressure in said motor is substantially atmospheric pressure, motor control means operable to vary the fluid pressurein said motor, and a valve device controlling communication through which the pressure. of fluid is varied in said motor by said motor control means and operable upon opera-I tion of said clutch control means to release fluid under pressure from said clutch control pipe. to'

prime mover to and from a member to be driven and for also controlling the power output of said prime mover comprising, in combination, means .operable upon supply of fluid under pressure to a clutch control pipe to effect engagement of said clutch and upon release of fluid under pressure from said pipe to effect disengagement of said clutch, clutch control means operable to effect a supplyv offluid under pressure to and its releasev from said pipe, a motor operable by fluid under pressure to adjust the power output of said prime mover in proportion to the pressure of fluid in said motor and to provide for a chosen reduced output of said prime mover when the pressure in said motor is substantially atmospheric pressure, and means associated with said clutchrcontrol means providing for opening of said motor to atmosphere upon operation of said clutchr control means to release fluid under pressure from said clutch control pipe and providing for varying the pressure of fluid in said motor subsequent to supply of fluid under pressure to said pipe.

32. An apparatus for controlling the operation of clutch' means arranged toconnect a prime mover to a member to be driven to provide for movement of said member in either one direction or the opposite direction and for also controlling the power outputof said prime mover, said apparatus comprising, in combination, clutch control means operable upon release of fluid under pressure from one pipe and supply of fluid under pressure to another pipe to actuate said clutchmeans to connect said prime mover and member to provide for movement of said member in said one direction and operable upon release of fluid under pressure fromI said other pipe and supply of fluid under pressure to said one pipe to actuate said vide for movement of said member in said one direction and operable upon release of fluid under pressure from said other pipe and supply of fluid under pressure to said one pipe to actuate said clutch means to connect said prime mover and member to provide for movement of said member in said opposite direction, manually controlled means movable to a certain position to effect the supply of fluid under pressure to one of said pipes and the release of fluid under pressure from the other pipe' and to a different position to effect the supply of fluid under pressure to said other pipe and the release of fluid under pressure from said one pipe, a motor operable by fluid under pressure to vary the power output of said prime mover in proportion to the pressure of fluid in said motor and to provide a chosenv reduced output when the pressure in said motor is substantially atmospheric pressure, motor control means operable to vary the pressure of fluid in said motor, and means operable upon release of fluid under pressure from either of said pipes to reduce the pressure in said motor to substantially atmospheric pressure and providing for an increase in such pressure to the degree provided by said motor control means upon subsequent supply of fluid under pressure to the other pipe. 35i. An apparatus for controlling the operation of clutch means arranged to connect a prime clutch means to connect saidprime mover and member to provide for movement of said member in said opposite direction, manually controlled means movable to a certain position to effect the supply of fluid under pressure to one of said pipes and the release of fluid under pressure from the other pipe and to a different position to effect the supply of fluid under pressure to said other pipe and the release of fluid: under pressure from said one pipe, a motor operable by fluid under pressure to vary the power output of said prime mover in proportion to the pressure of fluid in'said motor and to provide a chosen reduced output when the pressure in said motor is substantially atmospher- `ic pressure, motor control means operable to vary the pressure of fluid in said motor, and means operable upon movement of said manually controlled means out of either one of said positions to reduce the pressure in said motor to` substantially. atmospheric pressure and upon movement into either of said positions to provide for varying the pressure in said motor by operation o said motor control means.

33. An apparatus for controlling the operation of clutch means arranged to connect a prime mover to a member to be driven to provide for movement of said member in either one direction or'the opposite direction and for also controlling mover to a member to be driven to provide for movement of said member in either one direction or the opposite direction and for also controlling the power output of said primemover, said apparatus comprising, in combination, clutch control means operable upon release of fluid under pressure from one pipe and supply of `fluid under pressure to another pipe to actuate said clutch means to connect said prime mover and member to provide for movement of said member in said one direction andl operable upon release of fluid under pressure from said. other pipe and supply of fluid under pressure to said one pipe to actuate said clutch means to connect said prime mover and member to provide for movement of said member in said opposite direction, manually controlled means movable to a certain position to effect the supply o f fluid under pressure to one of said Vpipes and the release off-fluid under pressure from the otherlpipe and to a different position to effect the supply of fluid under pressure to said other pipe and the release of fluid under pressure from said one pipe, a motor operable by fluid under presssure to Vary the power output of said prime mover in proportion to the pressure of fluid in said motor and to provide a chosen reduced output when the pressure in said motor is substantially atmospheric pressure, motor control means operable to vary the pressure of fluid in said motor, a valve device -controlling communication through which fluid under pressure is supplied from said motor control means to said motor and operable upon operation of said manually controlled means to release fluid under pressure from either one of said pipes to reduce the pressure in said motor to substantially atmospheric pressure and upon the subsequent supply of fluid under pressure to the other pipe to effect an increase in pressure in said motor to the degree provided by said motor control means.

Y 35. .An apparatus for controlling the operation of clutch means arrangedto connect a prime .mover to.a member to be driven to provide for movement of said member in either'one direction or the opposite direction and for also controlling the power output of said prime mover.

said apparatus comprising, in combination, clutch control means operable upon release of fluid under pressure from` one pipe and supply of fluid under pressure to another pipe to actuate said clutch means to connect said prime mover and member to provide for movement of said member i-n said one direction and operable upon release of fluid under pressure from said other pipe and supply of fluid under pressure to said one pipe to actuate said clutch means to connect said prime mover and member to provide for movement of said member in said opposite direction, manually controlled means movable to a certain position to effect the supply of fluid under pressure to one of said pipes and the release of fluid under pressure from the other pipe means operable upon operation of said manually controlled means to effect a release of fluid under pressure from either of said pipes to disconnect said motor from said motor control means and to open said motor toatmosphere and upon subsequent operation of said manually controlled means to supply fluid under pressure to either of said pipes to connect said motor to said motor control means for control thereby.

36. An apparatus for controlling the operation of a clutch arranged to connect and disconnect a prime mover to and from a member to be driven and for also controlling the power output of saidprime mover comprising, in combination, clutch control means operable upon supplyV of fluid under pressure to a pipe to effect engagement of said clutch and upon release of fluid under pressure from said pipe disengagement of said clutch, a motor operable by fluid under pressure to adjustthe power output of said prime second position to effect opening of said motor mover in proportion to the pressure of fluid acting in said motor and to provide for a chosen reduced output of said motor when such pressure is substantially atmospheric pressure, and manual control means for said clutch control means and motor so constructed and arranged as to provide for varying the pressure of fluid in said motor upon supply of fluid under pressure to said pipe and operable to effect opening of said motor to atmosphere upon operation to release fluid under pressure from said p ipe.

37. An apparatus for controlling the operation of a clutch arranged to connect and disconnect a prime mover to and from a member to be driven and for also controlling the power output of said prime mover comprising, in combination, clutch control means operable upon supply of fluid under pressure to a pipe to effect engagement of said clutch and upon release of fluid under pressure from said pipe disengagement of said clutch, a motor operable by fluid under pressure to ad- J'ust the power output of said prime mover in proportion to the pressure of fluid acting in said motor and to provide for a chosen reduced output of said motor when such pressure is substantially atmospheric pressure, and manual control means for said clutch controi'means and motor havin-g a clutch engaging position for effecting a supply of fluid under pressure to'said to atmosphere.

.3.8. An apparatus for controlling the operation A of a clutch arranged to connect and disconnect a prime mover to and-from a member to be driven and for also ccntrollingthe power output of said prime mover comprising, in combination, clutch control means operable upon supply of fluid under pressure to a pipe to effect engagement of said clutch and upon release of fluid under pressure from said pipe disengagement of said clutch, a motor operable by fluid under pressure to adjust the power output of said prime mover in proportion to the pressure of fluid acting in said motor and to provide for a chosen reduced output of said motor when such pressure is substantially atmospheric pressure, and manual control means for said clutch control means and motor having a clutch engaging position for effecting a supply of fluid under pressure to said pipe and movable out of said position for effecting a release of fluid under pressure from said pipe and so constructed and arranged as to effect reducing of the pressure of fluid in said motor to substantially atmospheric pressure upon movement out of said position and to provide for varying the pressure in said motor only subsequent to movement to said position.

39. An apparatus for controlling the operation of a clutch arranged to connect and disconnect a prime mover to and from a'member to be driven and for also controlling the adjustment of van element for'varying the power output of said prime mover from a chosen low degree to a chosen high degree, comprising in combination with said clutch and element, manually controlled means operable to effect engagement and disengagement 40. An apparatus for controlling the operation of a clutch arranged to connect and disconnect a prime mover to and from a member to be driven and for also controlling the pressure of fluid in a cylinder which is operative to vary the output of said prime mover in accordance with the degree of such pressure and which provides for operation of said prime mover at an idling speed upon openingsaid cylinder to atmosphere, said apparatus comprising in combination with said clutch and cylinder, manually controlled means operable to effect engagement and disengagement of said clutch and means associated with said manually controlled means and so constructed and arranged-as to effect opening of said cylinder -to atmosphere upon operation of said manually controlled means to disengage said clutch and to provide for varying the pressure of fluid in said cylinder only subsequent to operation of said manually controlled means to effect engagement of said clutch.

41. An arrangement for controlling the operation of clutch means to connect and disconnect a prime mover to and from a member to be driven and for also controlling the power output of said 

